What ever controls the inside cabin temperature, like a blend door actuator, or valve in the heater hose should be looked at, I don't know BMW, but heat systems are pretty much the same. Other than that a cooling system flush would be in order.

Whenever Im driving heat comes through the vent and it also heats up my dash to the point where its hot to the touch. It comes through even if i have everyoff and in the cool position. Has anyone else...

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